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Effect of carboxylic acids on 2-bisbenzothiazole-2,2′- disulfide- and tetramethylthiuram disulfide-accelerated sulfur vulcanization. I. Reaction between the acids and accelerators

✍ Scribed by W. J. McGill; S. R. Shelver

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
172 KB
Volume
72
Category
Article
ISSN
0021-8995

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✦ Synopsis

Benzoic and stearic acids are shown to react with 2-bisbenzothiazole-2,2Јdisulfide (MBTS) and its polysulfides (MBTP) at vulcanization temperatures to form acid-accelerator complexes 2-benzoylthiobenzothiazole (BzM) and stearicthiobenzothiazole (StM), respectively. At higher temperatures MBTS, MBTP, BzM, and StM are decomposed by the acids. Analogous reactions are observed with tetramethylthiuram disulfide (TMTD) and its polysulfides (TMTP). Lesser amounts of acid-accelerator complexes 2-benzoyldimethyldithiocambamate and stearicdimethyldithiocarbamate are formed, but TMTP are more susceptable to decomposition at higher temperatures. The destruction of MBTP and TMTP by carboxylic acids will reduce the concentration of accelerator polysulfides available in compounds, and should impact negatively on vulcanization.

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